Make vCard parser invalid lines in vCard file which look like some comment. Do not merge.

e.g. "# Comment?"

In both vCard 2.1 and vCard 3.0, this syntax is never allowed, but some actual exporter seems to emit this kind of comment sometimes.

Both vCard 2.1 and vCard 3.0 allows some property to use multiple lines, so this change may cause another problem.
For example, if the "NOTE" property uses Quoted-Printable type, has several lines, and one of the lines starts with '#', we cannot know whether the line is "comment" or not.
Fortunately, in this change, the line is parsed as part of "NOTE" property, so I think there's no problem "right now", which does not mean that it is completely fine with vCard files Android will encounter in the future.

This change is already submitted into MR2.

Internal issue number: 2245363